Question

Let the function satisfy the equation f (x + y) = f(x)f(y) for all x, y ∈ R, where f (0)≠0. If f (5) = 3 and f'(0)=2, then f'(5) is

• A. 6
• B. 0
• C. 3
• D. -6

Answer 1

Answer: (A)

6

Answer 2

The correct answer is Option (A) : 6